This is why intelligent species from other planets never make contact. Perhaps they did a drive-by eons ago dumping their undesirables and flew off Now we're stuck with them.
It was also could explain Genesis in the bible as to the expulsion from the garden. It wasn't about bad apples after all. God and the angels didn't want to raise a bunch of nuts so they weeded them out. Somewhere along the line translators must have mixed up the two since both are vegetables.